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" When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called a right angle ; and the straight line which stands on the other is called a perpendicular to it. "
The Elements of geometry; or, The first six books, with the eleventh and ... - Page 2
by Euclides - 1855
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Euclidian Geometry

Francis Cuthbertson - Euclid's Elements - 1874 - 349 pages
...ACE, BCE are equal in all respects, and.-. AE is =BE; (i. i) ( 14 ) RIGHT ANGLES. DEFINITION. When one straight line, standing on another straight line,...the adjacent angles equal to one another, each of them is called a right angle; and the straight line which stands upon the other is said to be perpendicular...
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The Elements of Euclid, containing the first six books, with a selection of ...

Euclides - 1874 - 342 pages
...only one angle at a point, it may be expressed by the letter at that point ; as the angle at E. 10. When a straight line standing on another straight line, makes the adjacent angles equal to each other, each of these angles is called a right angle ; and the straight line which stands on the...
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A Military Dictionary: Comprising Terms, Scientific and Otherwise, Connected ...

George Elliot Voyle, G. de Saint-Clair-Stevenson - English language - 1876 - 676 pages
...barracks, &c. The term is also applied to substantive rank (viile Rank) in the army. Perpendicular — When a straight line standing on another straight...angles equal to one another, each of these angles is a right angle, and the line perpendicular. Persian Wheel — A contrivance for raising water from a...
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Elements of geometry, based on Euclid, books i-iii

Edward Atkins - 1876 - 119 pages
...(Const.); Therefore the angle DCF is equal to the angle EOF (I. 8) ; And they are adjacent angles. But when a straight line, standing on another straight...the adjacent angles equal to one another, each of the angles is callccl a. right angle (Def. 10) ; AD = Make CE = CD nnj A DBF equilatcral. * EC*' ....
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Primer of geometry

Francis Cuthbertson (geometer.) - 1876
...L DEFis equal to L KEL. Wherefore if two straight lines &c. QED RIGHT ANGLES. DEFINITION. When one straight line, standing on another straight line,...the adjacent angles equal to one another, each of them is called a right angle ; and the straight line which stands upon the other is - said to be perpendicular...
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Euclid's Elements of Geometry: Chiefly from the Text of Dr. Simson, with ...

Robert Potts - Geometry - 1876 - 446 pages
...together, but are not in the same btraight line. D NB If there be only one angle at a point, it may be expressed by a letter placed at that point, as the angle at E : but when several angles are at one point B, either of them is expressed by three letters, of which...
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Natural Philosophy for Beginners: With Numerous Examples, Part 1

Isaac Todhunter - Philosophy - 1877 - 440 pages
...said to be perpendicular to the other. This is put into a more precise form in the following manner: when a straight line standing on another straight...the adjacent angles equal to one another, each of the angles is called a right angle, and the 'straight line which stands on the other is called a perpendicular...
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Elements of geometry, based on Euclid, book i

Edward Atkins - 1877
...(Const.) ; Therefore the angle DCF is equal to the angle ECP (I. 8) ; And they are adjacent angles. But when a straight line, standing on another straight...the adjacent angles equal to one another, each of the angles is called a. right angle (Dcf. 10); Hake CK = CD ami A DF.F cquihiteiul. '. DCF = '! F.Cf....
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A Handbook of Descriptive Astronomy

George Frederick Chambers - Astronomy - 1877 - 978 pages
...each other in the same plane gives rise to a plane rectilineal angle, or simply an angle. \Vln 'ii a straight line, standing on another straight line, makes the adjacent angles equal to each other, each of those angles is called a riyht angle ; but if the adjacent angles are not equal...
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Euclid, book i., propositions i. to xxvi., with exercises and alternative ...

Euclides - 1877
...11) therefore the angle EGC is equal to the angle FGC ; (prop. 8) and they are adjacent angles ; but "when a straight line standing on another straight line makes the adjacent augles equal to one another, the straight line which stands on the other is perpendicular to it." (def....
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